EVENT_NAME cleanup

Clean up on MenuItem and ScrollViewEvent
Deprecation warnings

Warnings on ReadEvent, BonjourService and Network
Blob image size and crop function

Get the image dimensions of a blob, and also add the imageAsCropped
function.
Callback Registration comments

Java doc comments on CallbackRegistration.java
Cancel bubbling on an UIEvent

Implement cancelBubble on UIEvent.
ScrollViewEvent drag handlers + callback registrations

Implement the (iOS) ScrollView drag handlers.
Also add CallbackRegistrations to existing handlers.
ScrollView deceleration fringe issue on Android

As scrollview.decelerating is not defined on Android, remove this
fringe issue's propensity to crash the app by defaulting to "true" if
this member is not defined.
PostLayout callback registration on UIObject

Add callback registration return on UIObjects's post layout handler
adding.
ImageView loads GWT ImageResource

ImageView loads GWT ImageResource with proper clipping
ImageView implement toBlob and toImage

ImageView implement toBlob and toImage
Clean up View.java

Remove commented out code.
Add animationStartHandler
Merge pull request #2 from mvniekerk/master

ImageView, ScrollView, Layout and AnimationStart work